Watch for Dynamically Added Class

Try

$(document).ready(function() {

var target = $("#test").get(0);

// create an observer instance
var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
    // do stuff when
    // `attributes` modified
    // i.e.g., 
    alert(mutation.type);
    target.innerHTML = "class added: " 
                       + "<em>" 
                       + target.className 
                       + "</em>";
  });    
});

// configuration of the observer:
var config = { attributes: true };

// pass in the target node, as well as the observer options
observer.observe(target, config);

    $("#test").addClass("test-1");

    // later, you can stop observing
    // observer.disconnect();

})

jsfiddle http://jsfiddle.net/guest271314/35cVL/

see https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver